The only drawback to this throw-off are the mounting screw placements. They curl under the body of the unit and when you put the mounting screws in, they interfere with the throw-off arm. I had to grind down the screws 1/16" and then they mounted just fine. For the price, this is a good unit and it seems it will last a good long time. I would have expected a little more "attention to detail" from Gibraltar, but they will do.